the page I am having trouble with is this one:

Trying to make a member login php page appear in the template I have create for the website to keep it consistent.

The code I am using to do the include is:
<?php include($_SERVER['DOCUMENT_ROOT'].'/backstage_test/login.php'); ?>

I have done this before on other sites. But it's giving me an error I am not sure what to do with. Any help would be appreciated. Thanks Guys